Video by our Chemistry Expert Mohina MamDownload the Avanti Gurukul App from the google store now and get all the videos by India's top teachers on your phone. Click here to download: https://play.google.com/store/apps/de...Class 12 Chemistry – SolutionsWe come across solutions every day in our lives. We rarely come across any pure substance. But solution’s utility and importance depends on its composition. 1 ppm (parts per million) of fluoride ions in water prevent tooth decay and 1.5ppm causes the tooth to be mottled. So why do you think this happens? What governs these properties of the solutions? We can answer these questions through this chapter. We’ll learn1. What are Solutions?2. What is Solubility?3. Raoult’s Law.4. What are ideal and non-ideal solutions?5. Relative lowering of vapour pressure.6. Elevation of boiling point and depression of freezing point.7. Osmosis and osmotic pressure.8. What is Reverse Osmosis (R.O)?9. Van‘t Hoff factor and degree of dissociation / association.